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Linux is a powerful operating system widely used in DevOps for automation, deployment, and infrastructure management. Below is a comprehensive cheat sheet with essential commands and practical examples.
You Should Know:
1. File & Directory Operations
– `ls -la` – List all files (including hidden) with details.
– `chmod 755 file.sh` – Set execute permissions for the owner, read/execute for others.
– `find / -name “.log”` – Search for all `.log` files in the system.
– `grep -r “error” /var/log/` – Recursively search for “error” in log files.
2. Process Management
– `ps aux | grep nginx` – Check if Nginx is running.
– `kill -9 PID` – Forcefully terminate a process by PID.
– `systemctl restart apache2` – Restart Apache service.
3. Networking
– `netstat -tuln` – List open ports.
– `ssh user@remote-server` – Connect to a remote server via SSH.
– `scp file.txt user@remote:/path/` – Securely copy a file to a remote server.
4. Package Management
– `apt update && apt upgrade -y` – Update packages (Debian/Ubuntu).
– `yum install httpd -y` – Install Apache on CentOS/RHEL.
– `dpkg -i package.deb` – Install a `.deb` package manually.
5. Disk & System Monitoring
– `df -h` – Check disk space usage.
– `free -m` – Display RAM usage in MB.
– `top` – Real-time system monitoring.
6. DevOps Automation
– `crontab -e` – Schedule tasks (e.g., 0 3 /backup.sh).
– `docker ps -a` – List all Docker containers.
– `kubectl get pods` – Check Kubernetes pods.
What Undercode Say:
Linux commands are the backbone of DevOps. Mastering these ensures efficient server management, automation, and security hardening. Always verify commands in a test environment before production use.
Expected Output:
A fully functional DevOps environment with automated deployments, secure configurations, and optimized performance.
Prediction:
As DevOps evolves, Linux will remain central to cloud infrastructure, with increased integration of AI-driven automation tools.
Relevant URL: LinuxSimply DevOps Cheat Sheet
IT/Security Reporter URL:
Reported By: Https: – Hackers Feeds
Extra Hub: Undercode MoN
Basic Verification: Pass ✅
